[ale] XenServer 7.x problem - anyone else using it?

[Jim Kinney]

On Aug 9, 2016 10:52 AM, "Beddingfield, Allen" <allen at ua.edu> wrote:
>
> Interesting update to this:
>
> The problem ONLY occurs if I use Btrfs.  If I use XFS, it works as
expected.
> What INSIDE a VM could possibly mess with the underlying LVM volumes for
the virtualization host?

It's possible that the hosting environment wants to directly handle the
filesystem layer but has no capability for btrfs. I've seen this when
things are set for raw disk usage.

> As strange as it seems, I can readily duplicate it.
>
> Allen B.
>
> --
> Allen Beddingfield
> Systems Engineer
> Office of Information Technology
> The University of Alabama
> Office 205-348-2251
> allen at ua.edu
>
> On 8/5/16, 3:33 PM, "ale-bounces at ale.org on behalf of Beddingfield,
Allen" <ale-bounces at ale.org on behalf of allen at ua.edu> wrote:
>
>     I have a PowerEdge R815 with XenServer 7 installed.  I am using the
internal storage for VM storage (just a standalone server).
>     I've created a SLES 12 SP1 VM (using the template provided).
Everything goes fine, I can load up the OS, patch it, do whatever with no
problems.  However, if I power the VM down, I can't start it back.
>     I get "The SR failed to complete the operation".
>     If I ssh into the Xen server and run "lvdisplay", it shows the status
as "NOT available" - see below:
>
>     [root at xentest01 ~]# lvdisplay
>       --- Logical volume ---
>       LV Path
/dev/VG_XenStorage-bebcb0ae-252f-5c52-ca61-9e66b0aa5869/MGT
>       LV Name                MGT
>       VG Name
VG_XenStorage-bebcb0ae-252f-5c52-ca61-9e66b0aa5869
>       LV UUID                Cz6tVV-rCJp-Acu9-zC0T-PEo3-5tT3-2WLzsa
>       LV Write Access        read/write
>       LV Creation host, time xentest01, 2016-08-05 10:22:13 -0500
>       LV Status              available
>       # open                 0
>       LV Size                4.00 MiB
>       Current LE             1
>       Segments               1
>       Allocation             inherit
>       Read ahead sectors     auto
>       - currently set to     256
>       Block device           253:0
>
>       --- Logical volume ---
>       LV Path
/dev/VG_XenStorage-bebcb0ae-252f-5c52-ca61-9e66b0aa5869/VHD-9ebd5bf6-4613-4fc6-9aa0-738496dae1c9
>       LV Name                VHD-9ebd5bf6-4613-4fc6-9aa0-738496dae1c9
>       VG Name
VG_XenStorage-bebcb0ae-252f-5c52-ca61-9e66b0aa5869
>       LV UUID                vOZwtO-vuCF-WM26-hz3P-hghQ-dlsx-k5ZOvZ
>       LV Write Access        read/write
>       LV Creation host, time xentest01, 2016-08-05 14:08:25 -0500
>       LV Status              NOT available
>       LV Size                20.05 GiB
>       Current LE             5132
>       Segments               1
>       Allocation             inherit
>       Read ahead sectors     auto
>
>     [root at xentest01 ~]#
>
>     When I try to activate it, I get the following:
>
>     [root at xentest01 ~]# vgchange -a y
>       Operation prohibited while global/metadata_read_only is set.
>       Operation prohibited while global/metadata_read_only is set.
>       1 logical volume(s) in volume group
"VG_XenStorage-bebcb0ae-252f-5c52-ca61-9e66b0aa5869" now active
>     [root at xentest01 ~]#
>
>     Anyone have any idea what is going on? I've never had this issue with
previous XenServer installs, but this is my first with 7.x.  FYI, I can
readily reproduce this.  EVERY time I load a server and try this, I get the
exact same result.
>
>     Thanks.
>     Allen B.
>
>     --
>     Allen Beddingfield
>     Systems Engineer
>     Office of Information Technology
>     The University of Alabama
>     Office 205-348-2251
>     allen at ua.edu
>
>
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